I have Zan's Minimap and I have never been able to get the entity or player tracked working in anything, but single player where it works beautifully so I am skeptical about the map being the cause. I can say people do use hacks on the server though. While I can't prove it, yet, it is a bit of a problem. I love my map though. It tracks where I died, I can create waypoints to list where cities are, I can get a bird's eye view of the immediate area without making ugly 1x1 towers, etc. It's a useful tool for getting around and don't think it deserves full blame as the source of cheaters or hackers.